Feature Request: Allowing returns of multiple months in api/subscriptions/get_monthly_cost.php or in another endpoint

[SimpleAnecdote]

I've made a Wallos widget for Homepage dashboard. As part of that, I wanted to see at a glance:

• Number of Active Subscriptions
• Previous monthly cost
• Current monthly cost
• Next monthly cost

This results in 4 HTTP requests, 3 of which are to the same endpoint. I do think that the view of these three months is beneficial for people's dashboard. I am also trying to reduce the HTTP requests.

Was wondering if it'd make sense to be able to query this or another endpoint for a time-range.
I can see this working as a 3 month one, being made-for-purpose for this purpose. Alternatively, I can see a query for a time-range with an interval break of a month (or customisable) or for multiple months.

Anyone has thoughts about this? Maybe they have a similar issue/use-case with the same data or similar? Any thoughts about designing this end-point?